JP3065774B2 - Cable detent - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a retainer for a communication line in which it is not desirable to apply a side pressure to a core material such as an optical fiber cable. The present invention relates to a cable stopper.

[0002]

2. Description of the Related Art To construct a subscriber optical communication network, a feeder cable extending from a station to a distribution section, a distribution cable forming a distribution network in the distribution section, an outdoor optical line connecting the distribution cable and a subscriber terminal, Light indoor lines and various types of cables are required indoors. A conventional outdoor optical cable such as an optical outdoor line is disclosed in, for example, "Report on Research and Application", Vol.
As described on pages 1 to 544, a steel wire sharing the tension and a main body including an optical cable are twisted, and the steel wire is fixed to the detent and the friction caused by the twisting is applied. The cable was stopped.

FIG. 5 is an explanatory view of a retaining structure described in the above document. (A) is a schematic diagram of the shape of the retaining portion, where 11 is an optical cable, 12 is a support wire, 13 is a retaining member, and 14 is a retaining portion such as a telephone pole. This type of cable has a structure in which two parts are twisted, so that (B)
As shown in the figure, a steel wire 1 is
When a cable having a cross-sectional structure in which the cable 6 is arranged and joined together with the support wire 17 in a ball shape by PVC is adopted, the cross-sectional area is as large as 3 × 6.5 mm, and the transport drum becomes large due to the problem of the winding amount. There was a problem of doing.

In such a cable, a strong side pressure is locally applied when the cable is wound around a drum, and a reliability problem occurs in an optical cable weak in the side pressure. It is necessary to perform an inspection after the cable is laid to determine whether or not an abnormality due to local lateral pressure has occurred. However, there is a problem that the number of abnormal points cannot be determined due to too many abnormal points in backscattering measurement of the optical cable.

On the other hand, in recent years, as a small-diameter optical cable for subscribers having excellent weather resistance and lateral pressure resistance, as shown in FIG. 4, a stainless steel metal tube having an inner diameter of about 1 mm is covered with a plastic sheath. Optical fiber core wire 19 in 18
The cable which stored the loosely was developed.

However, when such a cable is to be stopped at a utility pole, a house, or the like, since there is no steel wire, a conventional steel wire stopper cannot be used, and a cable for suspending this cable is used. There was no effective detent.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and has been made to solve the above-mentioned problem. It is intended to provide.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a cable retainer in which a communication line is loosely housed in a jacket, wherein the substrate is provided with a through hole for passing the cable.
Rings provided at both ends of the substrate on the outer periphery of the through hole
Grooves and, within each of the grooves, the cable passing through the through hole.
On the outer periphery of the bull, the rear end abuts against the wall of the groove,
The tip extending obliquely from the edge toward the center of the substrate is
Claw that bites into the outer periphery of the cable
On the outer periphery of the cable, inside each of the claws,
From the outside of the substrate at both ends, insert the cylindrical tip into the substrate.
Push the tip of the claw by sliding in the center direction
Away from the cable jacket in the outward direction of the board.
The claw tip is moved out of the cable by sliding
The cable hold back member and the cable hold-back member characterized by including a releaser to secure bite into the
It is a cable that has been stopped .

[0009]

According to the present invention , a metal tube is coated with plastic.
Cables with communication lines loosely housed in the jacket
A ring-shaped tool provided at both ends of the substrate
A nail is stored in each groove, and the rear end of the nail is on the wall of the groove.
Abuts and extends diagonally from the rear end toward the center of the substrate
The tip of the lever is made of plastic around the cable.
Cut into the part and fix the cable. Of this cable
When tension is applied to one side,
A force is applied to the tip of the claw in the groove located in the direction where the tension acts.
And the force is transmitted from the tip of the claw to the trailing end and abuts
The movement is blocked by the wall of the groove, and the tip of the nail
The retaining force increases enough to dig into the plastic jacket.
The cable is fixed with sufficient force. In this case, the tip of the nail
After reaching the metal tube in the plastic jacket,
The bite is prevented and the communication line loosely housed in the jacket
Has no effect and transmission loss due to lateral pressure increases.
State does not arise.

[0010] The detent device is directly attached to a detent part such as a house or a utility pole, is attached by a support punch, or
It can be stopped by various methods such as mounting with a wire. Since the stopper is divided into two parts with respect to the jacket, it can be assembled integrally with bolts. Therefore, the stopper of the present invention can be easily separated from the cable and the installation location can be freely changed. Can be.

[0011]

First, an example of an optical fiber cable to which the stopper of the present invention is applied will be described. FIG. 4 is a cross-sectional view of the stainless steel pipe. Reference numeral 19 denotes a communication line made of an optical fiber. It is a subject. The communication line has a diameter of 250 μm by coating a glass single-mode optical fiber having a core diameter of 10 μm and a cladding diameter of 125 μm with a resin coating of 62.5 μm thickness.
μm.

FIG. 1 is a cross-sectional view of an embodiment of a stopper according to the present invention. FIG.
(B) is a sectional view of a state where the cable is separated. FIG. 2 is a sectional view taken along line XX of FIG. In the figure, 1 is a substrate, 2
Is a ring-shaped groove, 3 is a claw, 4 is a releaser, and 5 is a through hole of the cable 6. Note that the substrate 1 is 2
It is split and assembled together with bolts not shown. A through hole 5 for passing a cable 6 to which the stopper of the present invention is applied is provided in the center of the substrate 1 in the longitudinal direction. On the other hand, in the vicinity of both ends of the substrate 1, a groove 2 is provided along the inner periphery of the through hole 5, and in the groove 2, there are provided 12 divided claws 3 extending toward the axis of the through hole. (Fig. 2). The releaser 4 is inserted between the cable 6 and the claw 3 from both ends of the substrate 1 and can slide in the direction of arrow 7.

First, the cable 6 is drawn into the through hole 5 while holding the releaser 4 pressed into the center of the stopper. Then, as shown in FIG. 1 (A), when the releaser 4 is set outside the stopper, the tip of the claw 3 is not disturbed by the tip of the releaser 4, so that the claw 3 bites into the jacket of the cable 6 and grips the cable 6. Therefore, the cable 6 cannot be pulled out in this state. As shown in FIG. 1B, the releasers 4 on both sides are used.
Is pushed toward the center of the retractor, the tip of the releaser pushes up the distal end of the claw 3, and the cable 6 can be easily pulled out of the retractor.

An evaluation test was conducted on the retracting tool of the embodiment described with reference to FIGS. The optical fiber cable is shown in FIG.
And the resin-coated outer diameter is 250 μm
Using a communication line 19 made of an optical fiber having a thickness of 0.9 m
A prototype of a cable having an outer diameter of 3 mm and coated with polyethylene of m was produced.

The above-mentioned optical fiber cable was fixed to a stopper 8 as shown in FIG. 3, and this cable stopper was fixed to a utility pole by a fixing ring 9. As a result of applying a load to the cable in this state, the cable did not move even when a load of 20 kg was applied, and good detent characteristics were confirmed. In addition, no change was observed in the optical transmission loss before, after, and during the loading of the restraint.

After this evaluation test, the cable stopper was removed and taken out of the cable stopper. The outer layer coating of the cable was not affected by water penetration into the cable, such as holes or tears, and intrusion of dust. No anomalies that could cause problems were found.

From these results, it was confirmed that the stopper of the present invention not only has excellent ability to retain the cable, but also can retain the cable without deteriorating the reliability of the cable.

[0018]

As described above, according to the cable stopper of the present invention, a cable having a communication line loosely housed in a jacket can be stopped without applying a side pressure to the communication line. effective. Further, at the time of stopping, since an abnormality such as a hole does not occur in the jacket of the cable, it is possible to freely move the stopping portion.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of a cable stopper according to the present invention, in which (A) shows a state in which the cable is gripped, and (B) shows a state in which the cable is separated.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is an explanatory view of an example of a cable stopper according to the present invention.

FIG. 4 is a cross-sectional view of an example of a communication line to which the cable stopper of the present invention is applied.

FIG. 5 is an explanatory view of a conventional cable stopper.

[Explanation of symbols]

 1: substrate 2: groove 3: claw 4: releaser 5: through hole 6: cable 7: moving direction of releaser 8: detent 9: fixed ring

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shigeru Tanaka 1 Tayacho, Sakae-ku, Yokohama-shi, Kanagawa Prefecture Sumitomo Electric Industries, Ltd. Yokohama Works (72) Inventor Shigeru Tomita 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Japan Inside Telegraph and Telephone Corporation (72) Inventor Hiroyuki Akimoto 1-6-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (56) References Real public 36-2667 (JP, Y1) (58) Field (Int.Cl. ⁷ , DB name) H02G ^7/ 00-7/22

Claims (2)

(57) [Claims] 1. A cable stopper having a communication line loosely housed in a jacket, comprising: a substrate having a through-hole for passing the cable ; Provided at both ends
A ring-shaped groove and an outer periphery of the cable passing through the through hole in each groove.
A claw disposed on top of the claw, wherein a rear end of the claw is a wall surface of the groove.
Of the claw that abuts on and extends obliquely toward the center of the substrate.
The distal end bites into the outer periphery of the cable and is fixed.On the outer periphery of the cable passed through the groove, inside each of the claws, from the outside of the substrate at both ends of the through hole, a cylindrical distal end of the substrate A releaser that slides in the center direction to spread the tip of the claw, pulls it away from the cable jacket, and slides outward in the board so that the tip of the claw bites into the cable jacket and is fixed. A cable stopper comprising: 2. A cable stopper according to claim 1, wherein
Cable that has been stopped.